It is measured with the help of decoherence times, that depends upon the technology used for qubits. Qubits realized with superconducting circuits [1]} exhibits 100 micro-seconds of decoherence time. Although, the decoherence time is expected to gradually decrease with the development of quantum technology, the design of quantum networks must carefully consider the limitations introduced by decoherence. Therefore, decoherence along with other imperfections and fluctuations, introduce errors that degrade the teleported qubit, due to which the original information is lost. Thus, reliability of a teleportation system is measured with quantum fidelity which is considered as the fundamental figure of merit. It is the measure of how different two quantum states are, that takes any value between 0 and 1. So, larger the imperfections introduced by decoherence, the lower is the fidelity. All the effects of imperfections has been studied in [2]}, with experiments conducted IBM Q quantum processor [3]}.
